Read the extract below on the history of animals in space. Some of the dates have been omitted from the text. Can you put the correct date in its place? What helped you decide?


In _May 1959_, the United States sent a pair of monkeys, Able and Baker, into space on a Jupiter missile. They were the first living creatures to be successfully recovered after a trip into space.
Although Able died in June 1959, monkey Baker survived until _1984.
Later in _1959_and in early 1960 there were further experiments involving a pair of monkeys named Sam and Miss Sam.
Soviet scientists decided against using monkeys for test flights. Their scientific research - published in September 1958 - suggested the monkeys would have to be anaesthetized and the anaesthetic would interfere with test results.
They had already launched a dog, Laika, into space in
November 1957_. At the time, Russian scientists claimed the dog had survived a week in orbit but later reports show it died shortly after take-off from overheating and panic.
But it was the Russians who won the race to launch the first man into space. Major Yuri Alexeyevich Gagarin orbited the earth for nearly two hours on _12 April 1961_.



Text taken from the BBC news. Accessed on http://tinyurl.com/cq8p6



12 April 1961 November 1957 1959 May 1959 1984





Yo le respondí en ese orden porque es la manera más coherente para responder.

La información contenida en el texto que me ayudó a decidir como era.